Two previews of tonight's 'Dexter' finale

Ahead of tonight's shocking season finale of Dexter, here are two preview clips to whet your appetite.

How will Dexter (Michael C. Hall) manage to deal with Trinity's (John Lithgow) appearance at the station? Will Deb (Jennifer Carpenter) figure out the truth about Dexter's mother? What's Trinity's end game?

And more to the point, how significant is the episode's title 'The Getaway'?